package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class LoginInterceptor implements HandlerInterceptor {

    //手动注入
//    private StringRedisTemplate stringRedisTemplate;
//
//    public LoginInterceptor(StringRedisTemplate stringRedisTemplate) {
//        this.stringRedisTemplate = stringRedisTemplate;
//    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //用session登陆的代码
//        //1.获取session
//        HttpSession session = request.getSession();
//        //2.获取session中的用户
//        Object user = session.getAttribute("user");
//        //3.判断用户是否存在
//        if (user == null) {
//            //4.不存在，拦截，返回401状态码
//            response.setStatus(401);
//            return false;
//        }
//        //5.存在，保存在ThreadLocal
//        UserHolder.saveUser((UserDTO) user);
//        //6.放行
//        return true;


//       用token登陆，只有一个拦截器时候的代码
//        String token = request.getHeader("authorization");
//        if (StrUtil.isBlank(token)) {
//            response.setStatus(401);
//            return false;
//        }
//        String key = RedisConstants.LOGIN_USER_KEY + token;
//        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
//        if(userMap.isEmpty()){
//            response.setStatus(401);
//            return false;
//        }
//        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
//        UserHolder.saveUser(userDTO);
//        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
//        return true;

        //两个拦截器时候的代码
        //判断是否要拦截（ThreadLocal中是否有用户）
        if(UserHolder.getUser() == null){
            response.setStatus(401);
            return false;
        }
        return true;

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
